Dissertations / Theses on the topic 'Stereophotogrammetry'
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Murphy, Norman. "Ankle and subtalar joint kinematic description using stereophotogrammetry." Thesis, McGill University, 1988. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=61674.
Full textHenry, Robert Stuart. "Artefact detection and measurement of surface change in stereophotogrammetry Data." Thesis, Ulster University, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.646848.
Full textHenseler, Helga. "Three-dimensional breast assessment by multiple stereophotogrammetry after breast reconstruction with latissimus dorsi flap." Thesis, University of Glasgow, 2011. http://theses.gla.ac.uk/2981/.
Full textJunior, Alvaro Augusto Junqueira. "Análise antropométrica facial de um grupo de adultos jovens brasileiros saudáveis por meio da técnica da estereofotogrametria: estudo piloto." Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/58/58133/tde-07022014-135551/.
Full textThe human face presents characteristics according to dental occlusion, facial harmony, orofacial musculature, besides the format and configuration of craniofacial structures. Traditionally, anthropometric measurements have been acquired through direct measurements of a subject inside clinical environment, using calipers and metric tapes to measure distance between arches and landmarks. Along with scientific breakthrough, the data, used to be analogic, became digital. It opened the possibility of quick, precise and radiation-free acquisitions, with its details being simultaneously archived for future analysis and being able to be easily shared with patients and colleagues. Among new facial analysis methods the stereophotogrammetry technique has emerged, where a group of cameras with fast acquisition take photographs of the subject from multiple angles. The aim of this work was analyze the anthropometric profile of a group consisted of young Brazilian adults without symptoms of Temporomandibular Disorders (TMDs), aged between 18 and 30 years old, defining facial characteristics that are common to them, create a database of facial measurements for a portion of a young healthy Brazilian population to be used in future works and test the precision and repeatability of the Vectra M3® equipment. 60 young adult Brazilians without TMD participated in this study, 30 males and 30 females. The TMD diagnose was accomplished with the Research Diagnostic Criteria For Temporomandibular Disorders (RDC/TMD). After early Odontological exam, temporary craniometrical landmarks were performed in soft tissue and those subjects underwent to imaging acquisition by the stereophotogrammetry technique. 31 landmarks were used to make the measurements (in mm) of 42 distances. The equipment repeatability was tested in 20% of the sample (12 subjects), not having statistically significant difference (p>0.05) in none of the 42 distances between first and second acquisitions. The obtained results allowed the creation of a database containing facial distances of a portion of a young healthy Brazilian population. The distances Tr-N, N-Sn, Tr-G, Ls-Sto, Sto-Li, En[r]-En[l] e Prn-Sn didn\'t show statistical difference between the group GH and GM, while the other 35 distances were significantly greater in GH. The equipment Vectra M3® showed a high level of precision and repeatability.
Cousins, Michael. "An investigation into the use of stereophotogrammetry for the analysis of craniofacial dysmorphology in schizophrenia." Master's thesis, University of Cape Town, 2015. http://hdl.handle.net/11427/15467.
Full textBirkner, Luisa. "Vergleichende Untersuchungen zur Wiedergabegenauigkeit optoelektronischer berührungsloser und plastischer Abformungen weicher Gesichtsstrukturen." Doctoral thesis, Universitätsbibliothek Leipzig, 2014. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-139636.
Full textPUCCIARELLI, VALENTINA. "STEREOPHOTOGRAMMETRIC ANALYSIS OF THE HUMAN FACE: A TOOL FOR MODERN MORPHOLOGISTS." Doctoral thesis, Università degli Studi di Milano, 2018. http://hdl.handle.net/2434/543710.
Full textUffner, Neil E. "THREE-DIMENSIONAL ASSESSMENT OF THE EFFECTS OF EXTRACTION ON THE SMILE IN CLASS II HIGH AND LOW MANDIBULAR PLANE ANGLE PATIENTS." Master's thesis, Temple University Libraries, 2013. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/219332.
Full textM.S.
The annals of orthodontics are filled with studies aimed to understand how extraction orthodontic treatment might change the face. Although many studies have addressed profile changes due to extraction treatment, fewer studies have focused on how extractions change a patients smile. With the advent of surface imaging systems such as 3dMD, it is now possible to visualize the smile, and any changes incurred during orthodontic treatment, in three dimensions. Subjects for this study were chosen from the pool of 11-18 year old patients treated at the Podray Orthodontic Clinic at the Temple University Kornberg School of Dentistry. Subjects were Cl II patients, and must have been treated with either extraction of any combination of premolars or treated without extraction. Subjects were divided into four experimental groups based on two characteristics- mandibular angle (those with angles greater than 28o versus those with angles less than 28o) and treatment (extraction versus non-extraction). The resulting groups were separated as follows: high-angle extraction patients (n=8), low-angle extraction patients (n=6), high-angle non-extraction patients (n=7), and low-angle non-extraction patients (n=15). For each subject initial and final 3dMD images were superimposed using 3dMD Vultus software. A color histogram was constructed to visualize changes during treatment. The cheeks, commissures, upper and lower lips, chin, and nose, were also landmarked, and the changes in these landmarks were calculated. Volume changes were also calculated between pre and post treatment 3D data. Results showed that the lower lip and right commissure changes between high-angle extraction and non-extraction groups were statistically significant. A qualitative analysis of the histograms further supported these findings. In general, a greater change in soft tissue landmarks and soft tissue volumes could be seen in high-angle patients than low-angle patients. Differences in the changes that result from treatment type (extraction vs. non-extraction) were seen in the high-angle group. In contrast, similar changes result from treatment type (extraction vs. non-extraction) in the low-angle groups. Furthermore, the lip changes seen in extraction patients upon smiling are very similar to those changes seen in the same patient in repose. Most interestingly, soft tissue differences of the face due to treatment, growth, or both, seem to disappear upon smiling, with the exception of the lips. Qualitative assessment of these changes in the smile might be a more appropriate method for identifying soft tissue changes than statistical analyses. Similar studies with larger sample sizes are a promising direction for future research.
Temple University--Theses
Osborne, Patrick Rocha. "Avaliação retrospectiva do volume facial em pacientes submetidos a cirurgia ortognática utilizando a estereofotogrametria (foto 3D)." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/58/58136/tde-01032018-164843/.
Full textThe purpose of this retrospective study was to determine postoperative volume differences associated with orthognathic surgery, controlling for time, gender, age and side of face. Three-dimensional (3D) photographs were analyzed of eighteen patients submitted to simultaneous Le Fort I + Bilateral Sagittal Split osteotomies. The images were obtained using a Vectra® M3 device (Canfield, NJ, USA) and were captured postoperatively, at one week (1S), one month (1M), two months (2M), six months (6M) and one year (1A). The photo taken at 1A was used as the basis of comparison for the other photos (1S, 1M, 2M, 6M). Greatest facial volume was observed at one week after surgery (47,11 cm3, DP = 30,5 cm3), with men in this period showing higher values (67,27 cm3, DP = 33,54 cm3) than women (30,98 cm3, DP = 15,25 cm3) and the right side (26,58 cm3, DP = 17,22 cm3) higher than the left (20,52 cm3, DP = 14,93 cm3). The most extensive facial volume resolution occurred between the first week and the first month; postoperatively (58,9%). No significant difference was found between age groups.
Defay, David Kay. "3D facial analysis: unaffected parents of individuals with cleft lip/palate." Thesis, University of Iowa, 2011. https://ir.uiowa.edu/etd/944.
Full textRossetti, A. "ANALISI TRIDIMENSIONALE DELLA MORFOLOGIA FACCIALE CON L'UTILIZZO DELLA STEREOFOTOGRAMMETRIA." Doctoral thesis, Università degli Studi di Milano, 2012. http://hdl.handle.net/2434/168376.
Full textMENEZES, M. DE. "THREE-DIMENSIONAL FACIAL ANTHROPOMETRY." Doctoral thesis, Università degli Studi di Milano, 2010. http://hdl.handle.net/2434/150157.
Full textBishop, Richard. "Applications of Close-Range Terrestrial 3D Photogrammetry to Improve Safety in Underground Stone Mines." Thesis, Virginia Tech, 2020. http://hdl.handle.net/10919/98920.
Full textM.S.
The underground limestone mining industry is a small, but growing segment of the U.S. crushed stone industry. However, its fatality rate has been amongst the highest of the mining sector in recent years due to ground control issues related to ground collapses. It is therefore important to improve the engineering design, monitoring and visualization of ground control by utilizing new technologies that can help maintain safe and productive underground stone operations. Photogrammetry and laser scanning are remote sensing technologies that are useful tools for collecting three-dimensional spatial data with high levels of precision for many different mining applications. Due to the reality of budget constraints for many mining operations, this research concentrates on photogrammetry as a more accessible technology for the average operation, despite the challenging lighting conditions and expansive size of underground limestone mines that has previous hindered photogrammetric surveys in these environments. This research focuses on the applications of photogrammetry in underground stone mines and practical methodologies for implementing the techniques in working operations to better visualize hazards for improved engineering design and infrastructure management.
Memier, Michel. "Stéréophotogrammétrie numérique : calcul de M.N.T. par corrélation automatique d'images SPOT." Université Joseph Fourier (Grenoble), 1991. http://www.theses.fr/1991GRE10083.
Full textPisoni, L. "THREE-DIMENSIONAL ANALYSIS OF PALATE MORPHOLOGY IN UNILATERAL CLEFT LIP AND PALATE CHILDREN." Doctoral thesis, Università degli Studi di Milano, 2015. http://hdl.handle.net/2434/252652.
Full textCodari, M. "COMPUTER AIDED FEATURE EXTRACTION IN 3D ORO-MAXILLO-FACIAL IMAGES." Doctoral thesis, Università degli Studi di Milano, 2017. http://hdl.handle.net/2434/468280.
Full textMorel, Jean-Claude. "Appareil de compression biaxiale et sols renforcés." Université Joseph Fourier (Grenoble), 1996. http://www.theses.fr/1996GRE10017.
Full textNaaim, Alexandre. "Modélisation cinématique et dynamique avancée du membre supérieur pour l’analyse clinique." Thesis, Lyon, 2016. http://www.theses.fr/2016LYSE1014/document.
Full textSoft Tissue Artefact (STA) is one of the most important limitations when measuring upper limb kinematics through marker-based motion capture techniques, especially for the scapula. Multi Body Optimisation (MBO) has already been proposed to correct STA when measuring lower limb kinematics and can be easily adapted for upper limb. For this purpose, the joint kinematic constraints should be as anatomical as possible. The aim of this thesis was thus to define and validate an anatomical upper limb kinematic model that could be used both to correct STA through the use of MBO and for future musculoskeletal models developments. For this purpose, a model integrating closed loop models of the forearm and of the scapula belt have been developed, including a new anatomical-based model of the scapulothoracic joint. This model constrained the scapula plane to be tangent to an ellipsoid modelling the thorax. All these models were confronted to typical models extracted from the literature through cadaveric and in vivo intracortical pins studies. All models generated similar error when evaluating their ability to mimic the bones kinematics and to correct STA. However, the new forearm and scapulothoracic models were more interesting when considering further musculoskeletal developments: The forearm model allows considering both the ulna and the radius and the scapulothoracic model better represents the constraint existing between the thorax and the scapula. This thesis allowed developing a complete anatomical upper limb kinematic chain. Although the STA correction obtained was not as good as expected, the use of this approach for a future musculoskeletal models has been validated
Mokni, Moncef. "Relations entre déformations en masse et déformations localisées dans les matériaux granulaires." Grenoble 1, 1992. http://www.theses.fr/1992GRE10185.
Full textLallemant, Marine. "Etude du comportement des tissus périnéaux à l’accouchement : vers un modèle patiente spécifique." Electronic Thesis or Diss., Bourgogne Franche-Comté, 2024. http://indexation.univ-fcomte.fr/nuxeo/site/esupversions/c70b5126-d4ff-4d1d-adb1-d1d8a6693dca.
Full textPerineal tears, regardless of their severity, can be a source of physical and psychological morbidity in the immediate postpartum period and in the long term. Such injuries are experienced by approximately 60% of all women. To date, the occurrence of a perineal tear during childbirth remains unpredictable and is still poorly understood from a biomechanical perspective. The overarching objective of this thesis was to improve our knowledge of the biomechanical behaviour of the perineal tissues during childbirth and to obtain their biomechanical properties through three complementary approaches. The initial approach was experimental and ex vivo. The mechanical properties of the porcine perineum were investigated using uniaxial tensile tests, elastography and stereophotogrammetry in the basal state, then during deformation with a balloon pulled through a porcine vagina, which was used to simulate the processes occurring during childbirth. The second approach was clinical. An exploratory clinical trial was conducted to study in vivo the mechanical properties and deformation of the perineum during pregnancy and childbirth using elastography and stereophotogrammetry in pregnant women. The third approach was numerical. All the mechanical data obtained from imaging and clinical measurements were incorporated into a numerical model
Stančík, Petr. "Optoelektronické a fotogrammetrické měřicí systémy." Doctoral thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2008. http://www.nusl.cz/ntk/nusl-233413.
Full textChung, Vivian W. J. "Leveraging the use of existing C-arms for Roentgen stereophotogrammetric analysis." Thesis, University of British Columbia, 2015. http://hdl.handle.net/2429/56273.
Full textApplied Science, Faculty of
Graduate
Ruspi, Maria Luisa. "Studio della cinematica del nuoto a stile libero attraverso sensori inerziali." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2016. http://amslaurea.unibo.it/9952/.
Full textTillard, Dominique. "Etude de la rupture dans les géomatériaux cohésifs : application à la marne de Beaucaire." Grenoble 1, 1992. http://www.theses.fr/1992GRE10211.
Full textBaring, Toby. "Integrity of the repaired rotator cuff; a roentgen stereophotogrammetric analysis with ultrasound comparison." Thesis, Imperial College London, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.529381.
Full textHough, Jan K. "Assessment of and improvements to a stereophotogrammetric patient positioning system for proton therapy." Master's thesis, University of Cape Town, 1999. http://hdl.handle.net/11427/26784.
Full textBibliography: pages 125-129.
This thesis describes the construction and use of the facemask at the National Accelerator Centre (NAC) as used to both immobilise and position patients for precision proton radiotherapy. The precision achieved using the stereophotogrammetric (SPG) positioning system is measured, and the shortcomings and errors in using the facemask by the SPG system are measured and analysed. The implementation of improvements made to the SPG system is reported upon, and alternative means of both supporting the fiducial markers and immobilising the patient are investigated and evaluated. The accuracy of positioning a facemask using the SPG system is 1.4 mm and of positioning a newly designed frame is 1.6 mm. These measurements were made without using a patient. It is estimated that the total uncertainty of positioning a patient's tumour at the isocentre is 1.6 (1SD) mm using the facemask and it is estimated that the precision using the frame will be less than this value. The largest component of this error (1.39 mm) is due to the error in obtaining the CT scanner co-ordinates. These results are comparable to those obtained by other investigators. The movement of patient bony landmarks within the facemask was measured to be 1.0 ± 0.8 mm. Three main recommendations are that the CT scanner co-ordinating procedure be improved, the SPG computer program be rewritten in parts to achieve greater speed and accuracy, and that the new frame be used. The frame is easier to manufacture than the facemask and allows real time monitoring of the position of the patient's head by the SPG system thus allowing faster throughput of patients and better positioning quality control.
Millington, Steven Andrew. "Quantitative stereophotogrammetric & MRI evaluation of ankle articular cartilage and ankle joint contact characteristics." Thesis, University of Nottingham, 2008. http://eprints.nottingham.ac.uk/10484/.
Full textAarnivala, H. (Henri). "Deformational plagiocephaly:prevalence, quantification and prevention of acquired cranial asymmetry in infants." Doctoral thesis, Oulun yliopisto, 2017. http://urn.fi/urn:isbn:9789526215488.
Full textTiivistelmä Imeväisten nukuttaminen selällään on vähentänyt kätkytkuolemien määrää alle puoleen aiemmasta, mutta käytäntö on myös huomattavasti lisännyt asentoperäisen, ei-synostoottisen vinokalloisuuden esiintyvyyttä; tuoreen tutkimustiedon mukaan jopa lähes joka toisella imeväisellä on nähtävissä jonkinasteista asentovinokalloisuutta 7–12 viikon iässä. Etenkin USA:ssa ja muutamissa Keski-Euroopan maissa vaikea-asteista asentovinokalloisuutta hoidetaan aktiivisesti kypäräortoosein, mutta samanaikaisesti tietämys tilan luonnollisesta kulusta on vähäistä. Vaikka riskitekijöitä tunnetaan ja ehkäiseviä toimenpiteitä usein suositellaan, ei niiden tehosta ole juuri näyttöä. Nykyään 3D-pintakuvantamista käytetään usein vinokalloisten imeväisten seurannassa, mutta epäsymmetrian mittaamiseen käytettyjen muuttujien osuvuudesta ei ole tietoa. Tämän tutkimuksen tarkoituksena oli selvittää vastasyntyneiden vanhemmille annettavan vauvan käsittelyohjeistuksen vaikutusta asentovinokalloisuuden ilmaantuvuuteen satunnaistetussa, kontrolloidussa asetelmassa. Lisäksi pitkäaikaisseurannassa kartoitettiin asentovinokalloisuuden luonnollista kulkua ja ennusteeseen vaikuttavia tekijöitä suomalaisilla imeväisillä. Tutkimuksessa myös analysoitiin ja vertailtiin 3D-kuvista laskettavien epäsymmetriaa mittaavien muuttujien diagnostista osuvuutta. Käsittelyohjeita saaneiden lapsilla oli 3 kuukauden iässä merkittävästi vähemmän asentovinokalloisuutta ja kalloasymmetria oli lievempää kuin verrokkiryhmässä. Asentovinokalloisuuden esiintyvyys oli korkeimmillaan juuri 3 kuukauden iässä, jonka jälkeen merkittävää spontaania palautumista oli havaittavissa koko 12 kuukauden ikään jatkuneen seurannan ajan. Vastasyntyneillä nähty kalloasymmetria oli puolestaan ohimenevää, eikä myöskään vastasyntyneenä dokumentoitu kaulan liikerajoitus lisännyt myöhemmän vinokalloisuuden riskiä, vaan vinokalloisilla usein tavattava torticollis (kierokaula) näytti kehittyvän ensimmäisten elinviikkojen aikana yhdessä vinokalloisuuden kanssa. 3 kuukauden iässä havaittu imeväisen halu pitää päätään aina samaan suuntaan käännettynä oli yhteydessä kalloasymmetrian huonompaan spontaaniin palautumiseen. Tutkituista epäsymmetriaa mittaavista muuttujista OCLR erotteli vinokalloiset parhaiten. Yhteenvetona voidaan todeta, että ennaltaehkäisevä ohjeistus voisi vähentää vinokalloisuutta ja siitä aiheutuvia hoitokuluja kustannustehokkaasti, mutta vinokalloisuudelta on lupa odottaa myös merkittävää spontaania palautumista. Tutkimuksessa määritellyillä epäsymmetriaa mittaavien muuttujien raja-arvoilla on käyttöä sekä diagnostiikan että hoidon tavoitteiden määrittelemisen saroilla
Nilsson, Kjell G. "Kinematics and fixation of total knee arthroplasties : a clinical, radiographic, scintimetric, and roentgen stereophotogrammetric evaluation." Doctoral thesis, Umeå universitet, Ortopedi, 1992. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-100552.
Full textDiss. (sammanfattning) Umeå : Umeå universitet, 1992, härtill 7 uppsatser.
digitalisering@umu
Vuollo, V. (Ville). "3D imaging and nonparametric function estimation methods for analysis of infant cranial shape and detection of twin zygosity." Doctoral thesis, Oulun yliopisto, 2018. http://urn.fi/urn:isbn:9789526218557.
Full textTiivistelmä Pään ja kasvojen pehmytkudoksen 3D-kuvantaminen on yleistynyt lääketieteessä, ja siihen tarvittava teknologia on kehittynyt huomattavasti viime vuosina. 3D-mallit ovat melko tarkkoja, ja kuvaus stereofotogrammetriaan perustuvalla laitteella on nopea ja helppo tilanne kuvattavalle. Kasvojen ja pään 3D-mallien analysointi voi kuitenkin olla haastavaa, ja tarve tehokkaille kvantitatiivisille menetelmille on kasvanut. Tässä väitöskirjassa kehitetään uusia matemaattisia kraniofakiaalisten rakenteiden mittausmenetelmiä ja -työkaluja. Työ on jaettu kolmeen osaan. Ensimmäisessä osassa pyritään määrittämään liettualaisten kaksosten tsygositeetti kasvojen 3D-datan perusteella. Luokituksessa hyödynnetään tilastollista hahmontunnistusta, ja tuloksia verrataan DNA-testituloksiin. Toisessa osassa analysoidaan pään epämuodostumia imeväisikäisten päiden 3D-kuvista laskettujen pintanormaalivektorien suuntiin perustuvan jakauman avulla. Tasaisuuden ja epäsymmetrian määrää mitataan normaalivektorien suuntakulmien ydinestimaatin funktionaalien avulla. Kehitettyä menetelmää verrataan joihinkin aiemmin ehdotettuihin lähestymistapoihin mittaamalla kolmen kuukauden ikäisten imeväisten 3D-malleja ja tarkastelemalla asiantuntijoiden tekemiä kliinisiä pisteytyksiä. Menetelmää sovelletaan myös kliiniseen pitkittäistutkimukseen, jossa tutkitaan pään epämuodostumien ja niihin liittyvien riskitekijöiden kehitystä kolmena eri ajankohtana otettujen 3D-kuvien perusteella. Viimeisessä osassa esitellään uusi tilastollinen skaala-avaruusmenetelmä SphereSiZer, jolla tutkitaan yksikköpallon tiheysfunktion rakenteita. Toisessa osassa kehitettyjä työkaluja sovelletaan SphereSiZerin toteutukseen. SphereSiZer-menetelmässä tiheysfunktion eri skaalojen piirteet visualisoidaan projisoimalla tilastollisesti merkitsevät gradientit tiheysfunktiota kuvaavalle isoviivakartalle. Menetelmää sovelletaan imeväisikäisen pään pintanormaalivektoridataan ja simuloituihin, pallotiheysfunktioihin perustuviin otoksiin. Tulosten ja esimerkkien perusteella väitöskirjassa esitetyt uudet menetelmät toimivat hyvin. Menetelmiä voidaan myös kehittää edelleen ja laajentaa jatkotutkimuksissa. Pään ja kasvojen 3D-mallit tarjoavat paljon mahdollisuuksia uusien ja laadukkaiden analyysityökalujen kehitykseen myöhemmissä tutkimuksissa
Önsten, Ingemar. "Fixation of total hip components in rheumatoid arthritis and srthrosis a radiographic, roentgen stereophotogrammetric, densitometric and histomorphometric study /." Lund : Dept. of Orthopaedics, University of Lund, Malmö General Hospital, 1994. http://books.google.com/books?id=mGVsAAAAMAAJ.
Full textGold, Brenda Joan. "A roentgen stereophotogrammetric analysis system for the measurement of subsidence of the femoral components in total hip arthroplasty." Thesis, University of Cape Town, 1993. http://hdl.handle.net/11427/26276.
Full textBonci, Tecla. "La reconstruction du mouvement du squelette : l'enjeu de l'artefact des tissus mous." Thesis, Lyon 1, 2015. http://www.theses.fr/2015LYO10056/document.
Full textIn 3D human movement analysis performed using stereophotogrammetry and skin markers, bone pose can be only indirectly estimated. During a task, soft tissue deformations make the markers move with respect to the underlying bone generating soft tissue artefacts (STA), causing devastating effects on pose estimation and its compensation remains an open issue. The thesis’ aim was to contribute to the solution of this crucial issue. Modelling STA using measurable trial-specific variables is a prerequisite for its removal from marker trajectories. Two STA model architectures are proposed. A thigh marker-level model is first presented. STA was modeled as a linear combination of joint angles involved in the task. The model was calibrated with direct STA measures. The considerable number of model parameters led to defining STA approximations. Three definitions were proposed to represent STA as series of modes : individual marker displacements, marker-cluster geometrical transformations (MCGT), and skin envelope shape variations. Modes were selected using two criteria : modal energy and selecting them a priori. The MCGT allows to select either rigid or non-rigid components. It was also demonstrated that only the rigid component affects joint kinematics. A model of thigh and shank rigid component at cluster-level was then defined. An acceptable trade-off between STA compensation and number of parameters was obtained. These results lead to two main potential applications : generate realistic STAs for simulation
Jonsson, Håkan. "Knee joint laxity and kinematics after anterior cruciate ligament rupture : roentgen stereophotogrammetric and clinical evaluation before and after treatment." Doctoral thesis, Umeå universitet, Ortopedi, 1993. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-100568.
Full textDiss. (sammanfattning) Umeå : Umeå universitet, 1993, härtill 6 uppsatser
digitalisering@umu
Sabino, Danilo Damasceno. "Development of a 3D multi-camera measurement system based on image stitching techniques applied for dynamic measurements of large structures." Ilha Solteira, 2018. http://hdl.handle.net/11449/157103.
Full textResumo: O objetivo específico deste trabalho é estender as capacidades da técnica de rastreamento de pontos em 3 dimensões (three-dimensional point tracking – 3DPT) para identificar as características dinâmicas de estruturas grandes e complexas, tais como pás de turbina eólica. Um sistema multi-camera (composto de múltiplos sistemas de estéreo visão calibrados independentemente) é desenvolvido para obter alta resolução espacial de pontos discretos a partir de medidas de deslocamento sobre grandes áreas. Uma proposta de técnica de costura é apresentada e empregada para executar o alinhamento de duas nuvens de pontos, obtidas com a técnica 3DPT, de uma estrutura sob excitação dinâmica. Três diferentes algoritmos de registro de nuvens de pontos são propostos para executar a junção das nuvens de pontos de cada sistema estéreo, análise de componentes principais (Principal Component Analysis - PCA), decomposição de valores singulares (Singular value Decomposition - SVD) e ponto mais próximo iterativo (Iterative Closest Point - ICP). Além disso, análise modal operacional em conjunto com o sistema de medição multi-camera e as técnicas de registro de nuvens de pontos são usadas para determinar a viabilidade de usar medidas ópticas (e.g. three-dimensional point tracking – 3DPT) para estimar os parâmetros modais de uma pá de gerador eólico comparando seus resultados com técnicas de medição mais convencionais.
Abstract: The specific objective of this research is to extend the capabilities of three-dimensional (3D) Point Tracking (PT) to identify the dynamic characteristics of large and complex structures, such as utility-scale wind turbine blades. A multi-camera system (composed of multiple independently calibrated stereovision systems) is developed to obtain high spatial resolution of discrete points from displacement measurement over very large areas. A proposal of stitching techniques is presented and employed to perform the alignment of two point clouds, obtained with 3DPT measurement, of a structure under dynamic excitation. The point cloud registration techniques are exploited as a technique for dynamic measuring (displacement) of large structures with high spatial resolution of the model. Three different image registration algorithms are proposed to perform the junction of the points clouds of each stereo system, Principal Component Analysis (PCA), Singular value Decomposition (SVD) and Iterative Closest Point (ICP). Furthermore, operational modal analysis in conjunction with the multi-camera measurement system and registration techniques are used to determine the feasibility of using optical measurements (e.g. three-dimensional point tracking (3DPT)) to estimate the modal parameters of a utility-scale wind turbine blade by comparing with traditional techniques.
Doutor
Casanova, Pascal. "Bétons renforcés de fibres métalliques : Du matériau à la structure. Etude expérimentale et analyse du comportement de poutres soumises à la flexion et à l'effort tranchant." Phd thesis, Marne-la-vallée, ENPC, 1995. http://www.theses.fr/1995ENPC9517.
Full textSteel fibre reinforced concrete (SFRC) are rarely used in truly structural applications. This fact is mainly due to the lack of design tools, and consequently to the difficulty in quantifying the structural part due to these materials. The objective of this work is to give an answer to this matter in the case of beams. The structural performed tests have two goals : firstly, to study the failure mechanisms and, secondly, to validate the models developed in this work. Test are thus carried out in bending and shear. A global investigation tool, stereophotogrammetry, is used to study the cracking pattern : it shows clearly an early crack localization and the onset of a block mechanism which leads to a block type failure. These tests point out that the main mechanical characteristic of SFRC is their post cracking behaviour in tension. A uniaxial tension test on notched specimens is used, and developed, to measure a load – crack opening relationship. Specimens are cored, in the direction of the main load, to take into account the anisotropy due to concreting. A first type of model consists in postulating a failure mechanism, then in calculating the equilibrium of the structure, as a function of the crack opening, starting from the experimental relationship obtained in tension. Modelling of bending leads to good results. Concerning shear behaviour, the fibre part is correctly calculated and an equivalence relationship with classical stirrups is achieved. To take into account the observed scale effects, it is necessary to consider the evolution, with the crack opening, of the residual strength in tension. An empirical relationship is necessary to quantify the structural part of shear resistance. This illustrates the limits of simple models. Therefore, it seems necessary to use finite elements to model structures submitted to complex loading. A continuous approach (plasticity) and a discrete one (the LCPC’s probabilistic model) are used. To conclude, a complete study was carried out from the material to the structure. This study, experimental and theoretical, presents methods of analysis that, coupled with a global procedure from mix design to mechanical characterization, allow to optimize the desing of SFRC structural elements
Roger, Vincent. "Etude expérimentale et théorique de la localisation des déformations dans les matériaux granulaires en condition isochore." Université Joseph Fourier (Grenoble), 2000. http://www.theses.fr/2000GRE10022.
Full textSu, Chia-ping, and 蘇嘉平. "Wave measurement by Stereophotogrammetry – a primary study." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/09928001646283657947.
Full text國立成功大學
水利及海洋工程學系碩博士班
97
In this study, the camera in wave three-dimensional photography, image processing techniques applied analysis of wave field, its process consists of imaging the internal calibration, external calibration, image matching and three-dimensional image reconstruction. In which three-dimensional image reconstruction of the image matching is to study the core of this paper, Epipolar Geometry and Normalized Cross Correlation to image matching method to improve the efficiency of image matching. To reduce the image matching error, this paper, three cameras, and developing a nuclear program review. The results showed that the introduction of the third camera can seize the nuclear image matching accuracy and avoid a match with only two images of the phenomenon of miscarriage of justice. The findings of this study, to 23 × 23 pixels as the matching window size is the best result. This paper designs two kinds of tests of three-dimensional photographic technique, the measurement accuracy, the first is the flat position of the certification, equipped with 40-centimeter square tiles each of the room . The second is a high degree of measurement of the verification, using a static wave plate. Three-dimensional image reconstruction of the test results regardless of plane (ranging from 3 to 6 meters) and in wave height (3 cm) on the errors are less than 5%, studies have shown that cameras and the distance between the target and the camera between the camera Spacing distances affect the results of image reconstruction accuracy factor. This study also determined that the spacing of the camera does not need an unlimited extension of the distance between the camera and the shooting distance than the value of a balance, its high degree of accuracy will tend to be value.
ANCILLAO, ANDREA. "Stereophotogrammetry in human movement analysis: novel methods for the quality assurance, biomechanical analysis and clinical interpretation of gait analysis." Doctoral thesis, 2017. http://hdl.handle.net/11573/938022.
Full textBirkner, Luisa. "Vergleichende Untersuchungen zur Wiedergabegenauigkeit optoelektronischer berührungsloser und plastischer Abformungen weicher Gesichtsstrukturen: Dissertation zur Erlangung des akademischen Grades Dr. med. dent. an der Medizinischen Fakultät der Universität Leipzig." Doctoral thesis, 2013. https://ul.qucosa.de/id/qucosa%3A12402.
Full textTsai, Tsung-Yuan, and 蔡宗遠. "Development of a 3D Fluoroscopy Method and its Integration with Stereophotogrammetry to Study the Effects of Soft Tissue Artifacts on the Calculated Mechanical Variables of the Knee During Functional Activities." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/16552219252804844742.
Full text臺灣大學
醫學工程學研究所
98
Accurate measurement of the three-dimensional (3D) rigid body and surface kinematics of the natural and implanted knee is essential for many clinical applications. Skin marker-based stereophotogrammetry has been widely used in the in vivo, non-invasive measurement of 3D joint kinematics. However, the measured poses of body segments are subject to errors called soft tissue artifacts (STA). Existing techniques are limited either in their accuracy or lack of more realistic experimental evaluation of the measurement errors. The purposes of the study were to develop a volumetric model-based 2D-to-3D registration method, called the weighted edge-matching score (WEMS) method, for measuring accurate natural and implanted knee kinematics with single-plane fluoroscopy; to assess the 3D movement of skin markers relative to the underlying bones in normal subjects during functional activities; to access the effects of STA on the calculated joint variables at the knee in normal subjects during stair-ascent (SA); to quantify the STA and their effects on the calculated variables of the knee in patients with total knee replacements (TKR) during sit-to-stand (STS); and to validate the performance and effectiveness of global optimization method (GOM) with an appropriate kinematic model for compensating the STA for in vivo knee kinematics of normal, anterior cruciate ligament deficient (ACLD) and TKR subjects during functional activities. The precision of the WEMS method has been determined experimentally with cadaver knee and TKR. With the help of integrated 3D fluoroscopy method and stereophotogrammetry, considerable STA of normal and TKR subjects, during SA and STS respectively, were found and which led to significant differences of measured biomechanical variables of the knee. Compensating the effects of STA with GOM showed that the mean values of root mean squared error (RMSE) over all functional activities of all kinds of subjects were in the order of 3-6 mm for measurement of knee joint translations and about 3˚ for knee joint rotations. These findings suggested that GOM would be helpful for compensating STA in human motion analysis for basic research and clinical applications.
Osborn, Jonathan E(Jonathan Edward). "Design and calibration of close-range stereophotogrammetric systems in biology and biomedicine." Thesis, 1995. https://eprints.utas.edu.au/21106/1/whole_OsbornJonathanEdward1995_thesis.pdf.
Full textKunz, Jessica. "Kopforthesentherapie bei Patienten mit lagerungsbedingtem Plagiozephalus: Einfluss von Alter und Schweregrad der Asymmetrie bei Therapiebeginn auf die Therapiedauer und das Therapieergebnis." Doctoral thesis, 2020. https://nbn-resolving.org/urn:nbn:de:bvb:20-opus-208446.
Full textBackground Only few studies investigating the optimal time point to start head orthosis therapy for deformational plagiocephaly (DP) take into account the severity of skull asymmetry. The present study performs a 3D-analysis of the effects of age and severity of asymmetry on the final outcome. Methods A total of 144 patients with DP treated by molding orthosis were examined and divided into three age groups (I: <24 weeks; II: ≥24 to <32 weeks; III: ≥32 weeks) and two severity levels (mild-to-moderate: 30°-CVA ≥3mm to ≤12mm; moderate-to-severe: 30°-CVA >12mm). The extent of the reduction of asymmetry was analyzed using 3D-stereophotogrammetry. Results Therapy with molding orthosis led to a significant reduction in asymmetry in all defined age groups. Efficacy of reduction decreased with increasing age. Successful treatment (=CVAI <3.5%) of patients with mild-to-moderate asymmetry was achieved in 83%, 69% and 40% (groups I, II and III), respectively, in 50%, 30% and 7% of patients with moderate-to-severe asymmetry. The average duration of treatment increased from 18.6 to 25.3 weeks (age groups I and III). Conclusion Age at the beginning of treatment as well as severity of asymmetry have a definite impact on the duration and effectiveness of molding orthosis therapy
Linz, Christian. "Daten der ersten Kindervorsorgeuntersuchung (U1), Quantifizierung des einseitigen lagerungsbedingten Plagiocephalus und Evaluation der Therapie mit individueller Kopforthese mittels Sterophotogrammetrie." Doctoral thesis, 2013. https://nbn-resolving.org/urn:nbn:de:bvb:20-opus-77858.
Full textOBJECTIVE: Unilateral positional plagiocephaly is the most common deformity of the head in infants. As part of a prospective controlled clinical study, the pathomorphology of the positional plagiocephaly in early infancy was examined. The goal was to use noninvasive three-dimensional (3D) imaging to generate, for the first time ever, a standard database of infants without head deformities, to quantify the asymmetry of the positional plagiocephaly, and to evaluate the effectiveness of functional growth control using head orthesis. PATIENTS AND METHODS: In the present study, 3D soft-tissue data of the entire head were collected from a total of 40 infants: 20 with positional plagiocephaly (6.0 ± 0.97 months) and 20 infants without a head deformity (6.4 ± 0.3 months). Functional growth was controlled using a custom-made head orthesis. To evaluate the therapy, pre- and posttherapeutic scans were evaluated in three dimensions. RESULTS: The newbornscreening confirms the known risk factors of DP as male gender, number of deliveries and abnormal presentation. Compared with the control group, infants with positional plagiocephaly demonstrated a reduced maximum length of the head, an increased head height, a shift in the ear axis as well as asymmetric anterior and posterior volumes of the neurocranium in lateral comparisons. Therapy using head orthesis led to a significant improvement of the asymmetry, with a reduction of the diagonal difference and an adjustment of the posterior volumes. CONCLUSION: Conservative growth control of extrinsically deformed infant skulls represents an interdisciplinary medical expansion of the orthodontic therapeutic spectrum. To prevent potential effects of positional plagiocephaly on the viscerocranium, head orthesis therapy is advisable in infancy